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Research Article | DOI: https://doi.org/10.31579/2690-8794/082
*Corresponding Author: Mohammed Yunus, Hematopathology Laboratory, King Fahd Hospital of the University, Al-Aqrabiya, Al-Khobar Saudi Arabia.
Citation: Aljadar R., Yunus Md., Zaher A., (2021) Turmeric and Fenugreek - Herbal Agents to Alleviate Sickle Cell Disease. J, Clinical Medical Reviews and Reports. 3(7); DOI: 10.31579/2690-8794/082
Copyright: © 2021, Mohammed Yunus, This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received: 21 April 2021 | Accepted: 19 June 2021 | Published: 20 August 2021
Keywords: sickle cell disease; genetic disorder; homozygosity
Introduction: Sickle cell disease (SCD) is a genetic disorder with autosomal recessive inheritance causing abnormal hemoglobin. It is an important medical problem globally as well as in our community at Eastern province of Saudi Arabia. It accounts for large numbers of morbidity and to a lesser extent mortality. Several natural plant products over the world, which were known in some communities and their traditional healers, were studied and found to have properties in improving SCD manifestation. This research was planned to explore if any plant product under our study could prove being an effective anti-sickling agent for therapeutic use in SCD management.
Objectives: Studying the effects of some plants on sickled RBCs as well as comparing between efficacies of these different plants.
Material and Methods: The 49 fresh whole blood samples, extracted through venipuncture in EDTA tubes, were collected from known SCD patients whose homozygosity were confirmed by hemoglobin electrophoresis. These patients were not on recent blood transfusion or hydroxyurea, and aged 14 years or above of both sexes on clinical follow up. The dried rhizomes of turmeric (curcuma longa) powder and dried seeds flour of fenugreek (trigonella foenum-graecum) were used to evaluate the reversal type of anti-sickling activity on RBCs.
Results: Out of 49 blood samples, 28 (57.1%) samples were from males and 21 (42.9%) samples from females. The average (±SD) age of the cases was 28.2 (±9.97) years with range 14 – 60 years. Significant anti-sickling activity was found using Turmeric rhizomes extract treatment with 66.81% reversal effect, and 61.28% anti-sickling action when fenugreek seeds extract was used.
Conclusion: The findings of this study suggest that turmeric (C. longa) rhizome extract and fenugreek seed extract could have promising anti-sickling properties for SCD treatment.
Sickle cell disease (SCD) is an inherited red blood cell (RBC) disorder, caused by missense mutation of single base pair change (GAG ® GTG; adenine to thymine) in hemoglobin beta (HBB) gene leading to single amino acid substitution of valine for glutamic acid at the sixth position of beta-globin chain, resulting in hemoglobin S (HbS) production [1]. It could be homozygous (HbSS) or compound heterozygous like HbSC or HbS-beta thalassemia. Under hypoxic condition, HbS polymerizes resulting in RBC rigidity and distortion in morphology (sickled RBCs), that cause impaired microcirculation and extravascular hemolysis. The resultant clinical manifestations includes pain, vaso-occlusive crisis, splenic sequestration, acute chest syndrome, hemolytic anemia, and stroke. These manifestations are outcome of the pathophysiological processes that include vascular-endothelial dysfunction, oxidative and reperfusion injury, increased neutrophil adhesiveness, platelet activation, inflammation, and hypercoagulability [2, 3].
Our region (Eastern Province of Saudi Arabia) has the fifth major haplotype - the Arab-Indian type - (also called the Asian or Saudi haplotype). This has milder disease phenotype due to some genetic factors such as high levels of fetal hemoglobin and alpha thalassemia state that are commonly observed in the region [4].
The HbS polymerization leading to sickling has been mainstay of the pathophysiology of SCD. Hydroxyurea, a fetal hemoglobin inducing agent has been shown to decrease the number and severity of sickle cell crises [1-3, 5]. It has been approved by FDA (1998) and European Medicines Agency (2007). The Agency for Healthcare Research and Quality (AHRQ) in 2008 and the National Institutes of Health Consensus Development Conference has also recognized it [5, 7]. Various anti-sickling agents have been investigated and confirmed to have ameliorative properties [7].
Despite its wide acceptance, hydroxyurea is moderately toxic drug especially when administered for long-term duration [8]. In search of inexpensive but effective and readily available therapy, several investigations have been conducted on indigenous plant materials and their products. Among the commonly used plants in Nigeria and other African nations for management of many illnesses including sickle cell disease are leaves of Terminalia catappa (Indian almond) [9, 10] and Carica papaya (papaya).11 Others include Cajanus cajan (pigeon pea) seeds, [12] Adansonia digitata (baobab or upside-down tree) bark, Khaya senegalensis (African mahogany) leaves, and root of Fagara xanthoxyloides (Senegal prickly-ash or artar root) [13].
Anthocyanins extract of Trema orientalis was analyzed for anti-sickling/anti-hemolysis effect in vitro in Congo. It has been suggested that its effect was by interfering with intracellular polymerization of HbS or by scavenging the RBC free radicals [14]. The anti-sickling effect of ginger dried rhizomes has been in-vitro experimented [15].
The aim of this study is to explore if Trigonella foenum graecum or Fenugreek and Curcuma longa rhizomes could be effective as anti-sickling agents by reversing the already sickled RBC in order to alleviate sickle cell disease morbidity and to reduce the associated mortality.
Dried rhizomes of turmeric (curcuma longa) powder and dried seeds of fenugreek (trigonella foenum-graecum) flour were used for the study. Individually preparing 5 grams of each plant material in covered glass flasks, soaked in 200 ml normal saline (0.9% NaCl) for 25 mg/ml concentration in room temperature for 24 hours. These solutions were filtered and kept in 2-6 °C (refrigeration). The required amounts were taken and brought at room temperature for use at the time of procedure. 2% sodium hydrosulfite has been used as sickling agent.
After taking institutional (IAU/KFHU) approval, 49 fresh whole blood samples through venipuncture in EDTA tubes, were collected from known SCD patients whose homozygosity were initially screened by sickling test and confirmed by hemoglobin electrophoresis. The patients were sample part of the routine follow up CBC analysis. These patients were not on recent blood transfusion or hydroxyurea, and aged 14 years or above of both sexes on clinical follow up. The dehydration or over hydration have been avoided in the selection of cases. The experiment was performed to evaluate the reversal anti-sickling activity of the plants under study.
In this in vitro experiment for each blood sample, 0.1 ml of 2% Sodium Hydrosulfite sickling agent solution was added in test tube to 0.2 ml whole blood. This was gently mixed and kept for standing for 10 minutes at room temperature. The peripheral blood (PB) smear was made from the mixture (pre). After which, 0.1 ml of this mixture was added to 0.1 ml of each test containing plant materials (curcuma longa and fenugreek solutions) in separate test tubes. It was mixed thoroughly and kept at 37 °C in thermostatic dry incubator for 30 minutes. Subsequently, the PB smears were made (post). Both these (pre & post) PB smears were examined under x100 high power with oil emersion light microscope for estimating the percentage of sickled and non-sickled RBCs for anti-sickling assay (reversal effect). The following formula was used:
Percentage of sickled cells= number of sickled cells counted/number of total RBCs counted x 100
All data were analyzed by using IBM SPSS.20.0. Frequency and percentage was calculated for gender. Mean and SD was calculated for all quantitative measures. Paired t-test was used to compare the means of sickled and non-sickled cells before and after plant mixture while independent sample t-test was used to compare sickled and non-sickled cells between two methods. Probability (p-value) of ˂ 0.05 was considered as statistically significant.
A total of 49 known Hb SS sickle cell disease patients were included in this study. Majority 28 (57.1%) of cases were males while 21 (42.9%) were females (M: F = 1: 0.75). Figure 1
Average (±SD) age of cases was 28.2 (±9.97) years with range of 14 – 60 years. Majority of cases had age between 20 – 30 years. Figure 2
Figure 3 shows anti-sickling effect of two methods as compared with pretreatment (negative control). The upper and lower lines of the boxes indicate the upper and lower quartiles of the data and the middle bold lines indicate the median values. The whiskers indicate the minimum and maximum values.
The average percentage of sickled RBC before adding the extracts was 23.5 ±4.2% then after adding the fenugreek seeds extract the mean percentage of sickled cells was decreased to 9.1 ±3.3 (p value < 0 xss=removed>
Table 2 shows the percentage of normal RBC with pretreatment estimation of 76.6% while with Turmeric rhizomes extract showed 92.2% (p value < 0 xss=removed>
Table 3 shows that in relation to the pretreated sickled RBC, 61.28% of cells become corrected and reversed into non-sickled by applying fenugreek seeds extract with 38.72% remained irreversibly sickled. However, when turmeric rhizomes extract was used, 66.81% or around two thirds of sickled cells were normalized while 33.19% stayed uncorrected. Turmeric to fenugreek effect ratio of 1.09:1. (Figure 4)
Sickle cell disease is an inherited autosomal recessive disorder which is common in Sub-Saharan Africa, the Mediterranean areas, Arabian Peninsula, South Asia, and Southeast Asia. According to the World Health Organization, African population has the highest prevalence of the disease that ranges from 10-40% and in countries where the trait prevalence is over 20%, the disease affects about 2% of the people [16]. Generally, it is estimated that 7% of the overall populations in the world are carriers of hemoglobinopathies [17, 21].
The phytotherapy is recently used as an alternative medicine that can provide relief for SCD patients. The review of the literature indicated that various plants have been tested and shown to have anti-sickling potential effects, of which was Curcuma longa [18, 21]. It was reported that the extracts of rhizomes of C. longa have several pharmacological effects such as anti-inflammatory, anti-cancer, healing, cholesterol-lowering, hypoglycemic, anti-Alzheimer, anti-plasmodial, antioxidant, anti-venom, antibacterial, antifungal, antipyretic, and analgesic properties. It also has protective potential against diabetic retinopathy and other pathologies [18].
In this study, 49 fresh whole blood samples of confirmed sickle cell disease patients were collected. Majority 57.1% of cases were males (M: F = 1: 0.75). Average (±SD) age of cases was 28.2 (±9.97) years. Average percentage of sickled RBC before adding the extracts was 23.5 ±4.2% and, after adding Fenugreek seed extract the mean percentage of sickled cells was significantly decreased to 9.1 ±3.3 (p value < 0 xss=removed>
The anti-sickling potential of extracts from different organs (rhizomes, roots, leaves, petals, and sepals) of Curcuma longa was described by the researchers [18]. The most recent study of this plant for SCD management has also reported that the anti-sickling potential of different parts of Curcuma longa. Their results revealed that extracts of Curcuma longa leaves, which are rich in anthocyanin, have a prominent anti-sickling activity [22]. According to several studies, the anti-sickling effect of plants is mainly due to the presence of anthocyanins and organic acids. Anthocyanins interact with HbS, competing with the polymerization process and preventing RBC sickling [20, 21]. The total aqueous extracts as well as the total methanol extracts of different organs of Curcuma longa have shown considerable anti-sickling properties [18]. Several studies found that extracts of Curcuma longa, including from the flowers, contain large amounts of total polyphenols which have characteristic antioxidant and scavenging properties [23-25].
Although this study was limited with time constrain, manual-steps process but it was good to establish such a study in Saudi Arabia where SCD affects many patients particularly in Eastern and South Western areas.
Further studies are recommended to identify the specific compounds of different parts of these herbs that pharmacologically cause their therapeutic activity. Moreover, dose and additive effects as well as drug-interactions are suggested in future evaluation. In addition, in vivo researches with more objective, practical and validated advanced techniques are recommended, also, to correlate all of that with the disease phenotypes in multicenter analysis on larger cohort groups to provide more understanding of the beneficial effects of such plant products.
The finding of this study suggests that Turmeric (Curcuma longa) rhizome extract and Fenugreek seed extract were shown to have anti-sickling properties for SCD management. Further studies are required to confirm and explain the roles of plant products in-vivo.
I would like to thank those who kindly provide generous support, starting by my supervisor Associate Professor Mohammed Yunus for his scientific guidance and sincere criticism all the time. I also thank Professor Layla Bashawri, Professor Yasser Osman and Assistant Professor Amr Zaher for their role as advisory committee members. Also, special regards and appreciation to KFHU hematology laboratory staff as well as a lot of thanks to my colleagues and patients.
All authors declare that there is no conflict of interest.
No funding was provided.
Institutional Review Board (IRB) approval from Imam Abdulrahman Bin Faisal University was obtained before starting the research project.
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